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US867197A
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Block-signal system for electric railways.
Assignee: ROBERT S BEARD
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Filing: 1906-12-19
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Granted: 1907-09-24
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Expires: 1926-12-19
Abstract
No abstract record available.
Inventors
- 👤 Clayton W Hamm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:48
CPC Classifications
B; B61; B61L; B61L21/00; Y; Y10; Y10T; Y10T74/00; Y10T74/15; Y10T74/1526
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1910-09-23 | 1911-03-25 | 1911-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1914-09-23 | 1915-03-25 | 1915-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1918-09-23 | 1919-03-25 | 1919-09-24 | $7700.00 | Window Closed / Lapsed |